Telephone system



H. P, CLUSEN AND C. L.y GOODRUM.

TELEPHONE SYSTEM.

APPLICATION HLED DEC.28, 1918.

1,380Q357, Patented Jupe 7, 1921.

Ch @was L. C00 @7L/m by www UNITED STATES Parent ortica.

. HENRY P. 'cLAnsEN, oF-MOUNT VERNON, AND CHAR-Las L. @connut/i, or NEWYorin,` N. Y., '.AssIGNons To' WESTERN ELECTRIC COMPANY, rNooaronefrnn,or NEW YORK, N. Y., .A CORPORATION or NEW Yoan.

- inseam.

TELEPHONE sYsrnM..

Specification of Letters Patent.

Patented June 7, 192i.

Application filed December 28, 1918. Serial No. 258,683.

T 0 all io-7mm it may concern Be it known that we, HENRY P, CLAUSEN andCI-rAnLns'L. GooDnUM, citizens of the United States, residing at MountVernon,

in the county of Westchester and State of y New York, andatNew York,inthe county of NewYork and State of New York, respectively, haveinvented certain new and useful Improvements in Telephone Systems, ofwhich the following is a full, clear, concise, and exact description.

This invention relates to improvements in telephone systems and hasparticular reference to means for selecting an operators position.

An object of the invention is to enable an Operator to automaticallyselect any one of a number of distant operators positions over a commonwire by means of synchronized distributers.

The inventive idea involvedv is capable of receiving a variety ofexpressions one of which, for the purpose of illustrating the invention,is shown in the accompanying drawing; but it is to be expresslyunderstood that said drawing is employed merely for the purposefacilitating the description of the invention as a whole and not todeine the limits thereof, reference beino had to the appended claims forthis purpose.

The drawing illustrates diagrammatically the circuit involving thepresent invention.

ln the drawing 1 and 2 designate the conductors of a telephone lineleading to an operators position A, and 3 and 4L the limbs of a trunkcircuit for interconnecting said position with any one of a plurality ofoperators positions located at a distant station, two of which areindicated at B and C.

The apparatus at the several positions employed for establishing atalking connection may be Of any construction well known in the yart anda detailed illustration and description thereof is therefore deemedunnecessary. For the purpose of determining the selection of thepositions B and C there is provided at position A the keys B and Cwhich, when operated, will automatically cause the selection of thepositions at the distant station by energizing slOw-to-release relays 5and 6. Energization of these relays is controlled by distributers 7 and8, one of which is located at each station, and which are of any wellknown construction and opmon in the art. Joining these distributers is acommon conductor 9 over which the connection for energizing or 6 isestablished. f

It is believed thatthe invention will now befully understood from adescription of the operation. Should the operator at position A desireconnection to the operator at position B, the key B is operated and assoon as the wipers of the distributors 7 and 8 engage the contacts towhich conductors 10 andll are connected', a circuit will be closed forrelay extending from grounded battery, winding of relay 5, conductor 11,wiper of distributer 8, conductor 9, wiper of either of the relays 5distributer 7, conductor 10, contact l2 and spring 13 of key B toground. Relay 5 is energized and closes a circuit including thetelephone line leading to the operators apparatus at position B. Relay 5is made slow-to-release so that the same will not become denergizedduring a complete revolution of the wipers of distributors 7 and 8 andthe circuit to'station B will therefore loe maintained closed as long askey B remains ope-rated. A talking connection will now be establishedbetween the operators at positions A and B eXtending from the apparatusof position A, conductor l, contact 14 and its associated spring, limb3, inner armature and front Contact of relay 5, apparatus at position B,front contact and outer armature ot' relay 5, limb el., spring l5 andits associated contact and conductor 2 to the apparatus at position A.At the termination o a conversation, release of key B will remove groundfrom the conductor l() and thus cause the denergization of relay 5.which, in retracting its armatures, breaks the talking circuit betweenpositions A and B.

In the same manner as above set forth, the operator at position A mayconnect her apparatus to that at position C by operating key C toenergize slow-to-release relay 6, which maintains the talking connectionuntil key C is released.

lVhat is claimed is:

l. In a telephone system, a plurality of operators positions, means atone of said positions for determining the selection of any one of theother positions, means operated to select the position determined by therst named means, synchronized means connecting the irst and second namedmeans for controlling the operation of the latter,

and a common talking circuit completed by f the operation of the secondnamed means for interconnecting the first named position with said otherposition.

2. In a telephone system, a plurality of operators positions, means atone of said p0- sitions for determining the selection of any one of theother positions, a relay operated to select the position determined bythe rst named means, synchronized distributers connecting the irst namedmeans and said relay for controlling the operation of the latter, and acommon talking circuit completed through the contacts of said relay forinterconnecting the first named position with said other position.

3. In a telephone system, a plurality of operators positions, a commontalking circuit forV interconnecting said positions, means at one ofsaid positionsfor determinlng the selection of any one of the otherpositions, a relay operated independently of said talking circuit toselect the position determined by theiirst named means and to completethrough its contacts the talking circuit between the first named andselected positions, and synchronized means connecting the first namedmeans and said relay for controlling the operation of the latter.

In Witness whereof We hereunto subscribe our names this 12th day ofDecember, A. D.

HENRY P. CLAUSEN. CHARLES L. GOODRUM.

